Blow-out shoe



\ April 30, 1929. A; H. COOPER BLOW-OUT SHOE Filed March 19, 1926 Patented Apr. 30, 1929.

UNITED STATES ALVA H. COPER, 0F ATLANTA, GEORGIA.

:BLOW-OUT SHOE.

Application filed March 19, 1926.

This invention aims to provide a novei method of making blow-out patches or shoes in a strip. It contemplates, also, the fashion- .ing et the blowout patches on the curve which they will assume whilst they are in use in a tire casing, the result being that the patches will not buckle when placed in the tire casing, the strain on the stitching which unites the layers of the patch being relieved. moreover, since the layers of the patch or boot are stitched together in the form which the hoot will assume in a tire casing.

It is within the province of the disclosure to improve generally and to enhance the utility ot methods of the sort to which the pres ent application appertains.

Although a preterred embodiment has been shown, it will be understood that a skilled person working within the scope ot what is claimed, may depart somewhat from the specific disclosure, without departing from the spirit of the invention.

In the drawings Figure 1 shows diagrammatically, those steps which consist in carrying the stacks of patches, on a strip, into the field of a stitching mechanism, and flexing the stacks and the strip, at the time they are stitched, to assume the shape which the shoe will take in a tire casing; A

Figure 2 is a cross section of the finished boot or patch;

Figure 3 is a plan of the boot or patch developed;

Figure f1 is a cross section showing a slight modification.

In putting the invention into practice, stacks of suitable material, such as canvas, or canvas and rubber, are placed in spacedV relation on a strip, of canvas or any other material, the stacks being made up of superposed layers, the stacks being marked by the numeral 2, and the strip being designated by the numeral l.. rlhe stri p 1 is advanreil to carry the stacks 2 into the field oi. a stitching mechanism 3, the stacks beingstitched `to the strip as shown at 4, in any suitable fay. The strip 1 is severed at 5, at points between the stacks 2, after the stacks have been stitched to the strip. The result is that a string of blow-out boots may be made rapidly in a sin- Seral N'o. 95,948.

gle length and thencut up to form the commercial boot which is depicted in Figure 3 ott' the drawings. The constituent layers'of the stacks may be arranged in any desired way. For instance, shown in Figure 2, a small layer G may bo located between a larger layer '7 and that part 8 ofthe boot which is a portion of the strip 1: or, as shown in Figure Lt, the layers may decrease in area as they extend outwardly, the large member, which termed part of the stri 1, being designated by the numeral 9, the lJayer which is intermediate in size, and marked by the numeral 10, coming next, and the smallest layer 11 being on the outside.

Another speciic improvement consists in `flexing the stacks 2 of layers7 and the strip 1, as shown at 12 in Figure 1, to assume,\ap

proximately, the curve which the shoe will take when in use in a tire casing, the stitching at 4 (or its equivalent) being done whilst` the parts are flexed as at 12. As a result of .this step, the boot will not buckle when it goes into the tire casing, nor will the stitching be strained or broken when the boot is in use.

The strip l and the stacks 2 may be run over guide members 14, such as rollers `journaled for rotation, and over `a support 15, wherewith the stitching mechanism cooperates immediately. By shitting the rollers 1Lt,-the boot, at the time that it is stitched, may be held in a variety of diiferentcurves, varying in radius from the curvature shown at 12 to that indicated by the dotted are shown at 16m16. Whilst the strip 1 is being advanced, the patches probablywill be drawn a little out o't' their normal curvature, as designated at 17 in Figure 1, but when released from tension, they will reassume the normal curvature shown at 12 in Figure 1, and in Figures l2 land 4.

In a method ot `making blow-out shoes, steps which comprise placing superposcd layers on an elongated strip in stacks which are spaced apart longitrulinally of the strip, advancing the strip in the direction ot its length to carry the stacks one at a time into the iield of a stitching means, iexing the stri and the stacks transverselyof the length of t e strip and flexing the strip transversely aforesaid Curve, and severing the strip at points between the stacks after the stacks und the strips have been stitched together. 10 In testimony that I claim the foregoing as my own, I have hereto aHXed Iny signature.

ALVA H. COOPER. 

